rcv91cd

The RCV - rotary cylinder valve four stroke engine represents a major advance in model engine design. Although its moving components (piston, crank, cylinder and rotary valve) are totally conventional, they are arranged in a radically novel configuration to provide the aero modeller with several key benefits, whilst having similar handling characteristics to other 4-stroke model engines:-

CD Series Feature

Ultra Compact Design - over 1" shorter than conventional 52 4-stroke engines
Low Noise - Unique Real Engine Sound
Uses Conventional Propellers Sizes
Can be mounted inverted
Low Maintenance
Easy to Tune
2-Year Guarantee
Low Cost Spares
Suitable for modellers of all skill levels

The RCV 4-cycle engine has only one more moving component than a 2-cycle engine -the rotating cylinder itself. The cylinder is suspended between two bearings which allow it to rotate freely around the piston; the piston, and crank are entirely conventional. A gear formed around the base of the cylinder meshes with a gear on the crank. As the piston reciprocates and the crank turns, the cylinder rotates around the piston.

At the top end of the rotating cylinder there is a single port leading to the combustion chamber. This is surrounded by a fixed timing ring with three radially arranged ports; inlet, ignition and exhaust. This simple valve arrangement serves the combustion chamber as the engine cycles through the conventional 4-cycles: induction, compression, power and exhaust. Ignition is achieved through a standard 4-cycle glow plug exposed once only during each complete cycle.

The rotating cylinder is effectively combined with the rotary valve in a single component hence - RCV - Rotating Cylinder Valve.

Specification

After the considerable success of the RCV58-CD, the latest addition to our RCV CD range is the RCV91-CD. This has been designed to meet the demand from aero modellers who want a quality engine, that is easy to use and is competitively priced. Comparable in power to conventional 91 4-stroke engines (or .60 2-stroke engines), this is the ideal choice for scale, aerobatic, fun and general flying.

The engine still uses RCV's unique rotary valve system - which has only one extra moving component to a 2-stroke and so is easy to maintain. This ultra-compact engine is the same height as a conventional .52 4-stroke engines (or .60 2-strokes) which makes cowling much easier than other 4-strokes

So if you are looking for a reliable, easy to use 4-stroke engine, that is the same height as a 2-stroke engine, our die cast RCV91-CD engine is a perfect option.

A = 103MM
B = 81.4MM
C = 95.7MM
D = 119.7MM

E = 47MM
F = 43MM
G = 48.5MM
H = 68.5MM
I = 45MM
J = 53MM
K = 55MM

Imperial Metric Manufacture Die Cast

Engine Type 4-stroke - Glow ignition

Displacement 0.91 cu inch 15 cc

Max Power (approx.) 1.5 bhp 1.12 kw Weight (exc. silencer) 25.2 oz 715 g Length 4.72 inch 120 mm

Height - centre line axis 3.23 inch 82 mm Cowling Radius R70

Propeller shaft diameter 5/16" UNF

Practical RPM range @ prop 2,200 - 11,000 rpm

Example prop sizes (2-blade) 13x6, 14x6, 14x7